Hi,
I have extracted the essential code snippets.
In this case the interval is 1 second but 75% CPU usage (P4/1.5GHz),
if I add more controls first cpu usage increaes and later the
interval grows too.
But if I remove the background image, cpu usage is about 5%
I am using javaScript only for testing and to compare different
viewers/platforms
Later I would like to build a windows application using compiled code
in context of an "SVG viewer component" like eSVG, Mobiform,...
Regards Friedhelm
viTest.js
=========
var text;
var rect;
var anim_timer;
function OnLoad(evt)
{
//anim_timer = setInterval("OnTimer()", 1000);
anim_timer = setTimeout("OnTimer()", 1000);
}
function OnTimer()
{
var id;
var i;
var symbol;
for(i=1; i<=15; i++)
{
var RandVal = Math.random();
// set with of rect by random value
if (i<10)
id = "fill0" + i;
else
id = "fill" + i;
rect = document.getElementById(id);
rect.setAttribute('width', RandVal*100);
}
setTimeout("OnTimer()", 1000);
}
viTest.svg
==========
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG
1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd";>
<svg width="100%" height="100%" preserveAspectRatio="xMinYMin"
xmlns:xlink="http://www.w3.org/1999/xlink"; viewBox="0 0 1024 768"
xmlns="http://www.w3.org/2000/svg"; onclick="1" onload="OnLoad(evt)">
<script type="text/ecmascript" xlink:href="viTest.js" />
<title>Test Performance </title>
<image fill="#111" stroke-opacity="1" x="20" y="20" width="100"
height="100" transform="matrix(10.2304,0,0,7.42512,-205.313,-
148.255)" xlink:href="Main.JPG" />
<g id="N01_BAR" class="dynamic">
<rect fill="#3333ff" stroke="#3333ff" id="fill01" x="202.45"
y="3.71" width="96" height="16" />
<rect fill="#3333ff" stroke="#3333ff" fill-opacity="0"
id="frame" x="200.45" y="1.71" width="100" height="20" />
</g>
....
<g id="N15_BAR">
<rect fill="#3333ff" stroke="#3333ff" id="fill15" x="202.45"
y="702.63" width="96" height="16" />
<rect fill="#3333ff" stroke="#3333ff" fill-opacity="0"
id="frame" x="200.45" y="700.63" width="100" height="20" />
</g>
</svg>
--- In svg-developers@yahoogroups.com, Mario Vernari <[EMAIL PROTECTED]>
wrote:
> Hi Friedheim,
> I agree with Domenico.
> SCADA using SVG synopthics is my main job, since over 2 years.
> I have several examples of SVG's taking almost no CPU.
>
> The worstest problem (I'd say "fault") of SVG is that you cannot
control how
> much the SMIL animation can eat CPU.
> So most of the time you have to manage the code (losing even lot of
time) to
> adjust animations so that the CPU is within acceptable margins.
> Don't refuse the Javascript+DOM animation: in many situations it
would be
> convenient.
> Cheers
> Mario
>
>
>
> On Monday 21 February 2005 11:56, friedhelmeichin wrote:
> > I am trying to build a scada mmi prototype with svg. For this I
used
> > a background image (1024x768 *.png or *.jpg file) and in
foreground
> > some simple dynamic controls like "led, bargraph, text,
symbol,...).
> > To get the dynamic behaviour, I used JavaScript and the DOM to
change
> > some attributes (text, color, visibility,...) of the controls
once
> > per second.
> >
> > I work with IE+ASV to show this graphic. There I get a really bad
> > performance (97% CPU usage, 3s interval instead of 1s), if I
don't
> > use the attribute image-rendering="optimizeSpeed" at the
background
> > image element.
> > When I use "optimizeSpeed" performance is ok, but I am not sure,
if
> > the quality of the graphic is sufficient for a comercial product.
> >
> > Is this a typical behaviour?
> >
> > Are there other ways to increase performance?
> >
> > I am looking forward to get response from anybody, who has some
> > experience in this case.
> >
> > Regards
> > Friedhelm
> >
> >
> >
> >
> >
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